1264573381 has 2 divisors, whose sum is σ = 1264573382. Its totient is φ = 1264573380.

The previous prime is 1264573361. The next prime is 1264573423. The reversal of 1264573381 is 1833754621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804856900 + 459716481 = 28370^2 + 21441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264573381 is a prime.

It is a super-2 number, since 2×1264573381² = 3198291671867542322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1264573361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632286690 + 632286691.

It is an arithmetic number, because the mean of its divisors is an integer number (632286691).

Almost surely, 2^1264573381 is an apocalyptic number.

It is an amenable number.

1264573381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264573381 is an equidigital number, since it uses as much as digits as its factorization.

1264573381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 1264573381 is about 35560.8405553075. The cubic root of 1264573381 is about 1081.3875002345.

The spelling of 1264573381 in words is "one billion, two hundred sixty-four million, five hundred seventy-three thousand, three hundred eighty-one".